Aromatic A-ring analogues of orobanchol, new germination stimulants for seeds of parasitic weeds
作者:Heetika Malik、Wouter Kohlen、Muhammad Jamil、Floris P. J. T. Rutjes、Binne Zwanenburg
DOI:10.1039/c0ob00735h
日期:——
Strigolactones are signaling compounds in plants of increasing importance. In this paper the focus is on their activity as germinating agents for seeds of parasitic weeds. The syntheses of aromatic A-ring analogues of the germination stimulant orobanchol have been described. Starting substrate is the ABC unit of the stimulant GR24. Oxidation at the C-4 position gives a 4-oxo derivative which on subsequent
松果内酯是植物中越来越重要的信号化合物。在本文中,重点是它们作为寄生杂草种子发芽剂的活性。已经描述了发芽刺激剂邻苯二酚的芳族A环类似物的合成。起始底物是刺激物GR24的ABC单元。氧化在C-4位置给出了对随后的还原产生两个C-4差向异构的醇,4-氧代衍生物顺式和反以82比:3.对于C-4的实际访问抗醇,主要的顺式通过Mitsunobu程序将差向异构体倒转。该反然后,将C-4醇与D环通过一锅两步过程进行偶联,该过程涉及甲酰化反应以及与D环的反应。 溴丁烯内酯得到邻苯二酚的非对映体芳族A环类似物的混合物。相反,顺式C-4醇不能直接与D环偶联。保护C-4 syn OH是必要条件。最好的保护功能是SEM基团,因为与D环偶联后可以轻松实现脱保护。这些新类似物的结构已通过X射线分析确定。C-4 syn的非对映异构体以及C-4抗邻苯二酚类似物均已被测试为Striga hermonthica和Orobanche